/*
 * Copyright (C) 2005-2011 MaNGOS <http://getmangos.com/>
 * Copyright (C) 2008-2014 Hellground <http://hellground.net/>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include "Sha1.h"

#ifndef HELLGROUND_WARDEN_KEY_GENERATION_H
#define HELLGROUND_WARDEN_KEY_GENERATION_H

class SHA1Randx {
public:
    SHA1Randx(uint8 *buff, uint32 size) {
        uint32 taken = size/2;

        sh.Initialize();
        sh.UpdateData(buff,taken);
        sh.Finalize();

        memcpy(o1,sh.GetDigest(),20);

        sh.Initialize();
        sh.UpdateData(buff+taken,size-taken);
        sh.Finalize();

        memcpy(o2,sh.GetDigest(),20);

        memset(o0,0x00,20);

        fillUp();
    }

    void generate(uint8 *buf, uint32 sz) {
        for(uint32 i=0;i<sz;i++) {
            if(taken == 20) {
                fillUp();
            }

            buf[i] = o0[taken];
            taken++;
        }
    }
private:
    void fillUp() {
        sh.Initialize();
        sh.UpdateData(o1,20);
        sh.UpdateData(o0,20);
        sh.UpdateData(o2,20);
        sh.Finalize();

        memcpy(o0,sh.GetDigest(),20);

        taken = 0;
    }
    Sha1Hash sh;
    uint32 taken;
    uint8 o0[20],o1[20],o2[20];
};

#endif
